2K XJ low compression on cyl 3&4
05-27-2018, 10:34 PM
#1
Newbie
Thread Starter
Join Date: May 2018
Location: Miami, Florida
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
Engine: 4.0HO
2K XJ low compression on cyl 3&4
Hello, just bought a 2000 XJ already started on a full interior Nd exterior restore. Just hit a roadblock today. I have the 0331 head and cyl 3&4 has low compression. 80psi. Could this be fixes with a new head or do i need a full rebuild??
05-27-2018, 10:54 PM
#2
Senior Member
Low compression in adjacent cylinders frequently is caused by head gasket failure. You'll need to pull the head to be sure. (Given that's the case you'll probably want to get a replacement head rather than reinstall the 0331.)
If you also have low oil pressure that would be a reason for complete rebuild or engine replacement.
If you also have low oil pressure that would be a reason for complete rebuild or engine replacement.
05-28-2018, 07:30 AM
#3
Newbie
Thread Starter
Join Date: May 2018
Location: Miami, Florida
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee (XJ)
Engine: 4.0HO
Thanks Rambler, yes i will be replacing that head. My oil pressure is between 40 and 50 at cold start. Between 10 and 20 idle and around 35/40 while driving. I remove the valve cover to inspect and there was no obvious signs of crack but im sure thers something there since both pistons have equally low compression.
Last edited by Tarec2000; 05-28-2018 at 07:39 AM.
Thread
Thread Starter
Forum
Replies
Last Post
$200xjbuild
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
08-15-2016 05:21 PM
WMcGregs
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
4
11-13-2012 11:41 AM
ThE_CaPtaIn
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
8
07-27-2011 05:40 PM
00xj-classic
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
12-16-2009 10:03 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)